1. A rectangular box has a square base, four sides, but no top. It has a volume of 20 cubic feet.
Let A be the surface area of the box, and L the length of one side of the base.
(a) The volume is measured in cubic feet. What units are convenient to use for the area A
and the side length L?
(b) Is A a function of L? If no, explain why not. If yes, nd the formula of A in terms of L
and point out its domain.